Managing water sustainably at household level?

So it's the wettest summer in UK on record....ever....so why doesn't it surprise me that someone somewhere is saying that we don't have enough water! Reservoirs not at capacity and groundwater levels going down in some places seems to be how that's worked out. Is 'enough water' just another social construct? Although there are undoubtedly biophysical elements that can be measured and compared with past times, what do those comparisons mean? In the UK many of us are pretty ignorant about where our water comes from or goes to and what it means to use water sustainably. But it doesn't take long living in an area where water's in short supply to cut usage substantially and there's no quicker way to slow down usage than to have to carry what is needed by hand. Must be devastating to experience floods at home and not a lot we can do about the quantity of rain we're getting right now but perhaps a lot more we can do about our water use and infrastructure at a household level? Examples include not paving over our gardens and avoiding using drinking quality water where clean waste water or rain butt water will do.